<template>
<div>
    <!-- <div id="menu">
        <button id="table">TABLE</button>
        <button id="sphere">SPHERE</button>
        <button id="helix">HELIX</button>
        <button id="grid">GRID</button>
    </div> -->
    <div id="container"></div>
</div>
</template>

<script>

var table = [
    "H", "Hydrogen", "1.00794", 1, 1,
    "He", "Helium", "4.002602", 18, 1,
    "Li", "Lithium", "6.941", 1, 2,
    "Be", "Beryllium", "9.012182", 2, 2,
    "B", "Boron", "10.811", 13, 2,
    "C", "Carbon", "12.0107", 14, 2,
    "N", "Nitrogen", "14.0067", 15, 2,
    "O", "Oxygen", "15.9994", 16, 2,
    "F", "Fluorine", "18.9984032", 17, 2,
    "Ne", "Neon", "20.1797", 18, 2,
    "Na", "Sodium", "22.98976...", 1, 3,
    "Mg", "Magnesium", "24.305", 2, 3,
    "Al", "Aluminium", "26.9815386", 13, 3,
    "Si", "Silicon", "28.0855", 14, 3,
    "P", "Phosphorus", "30.973762", 15, 3,
    "S", "Sulfur", "32.065", 16, 3,
    "Cl", "Chlorine", "35.453", 17, 3,
    "Ar", "Argon", "39.948", 18, 3,
    "K", "Potassium", "39.948", 1, 4,
    "Ca", "Calcium", "40.078", 2, 4,
    "Sc", "Scandium", "44.955912", 3, 4,
    "Ti", "Titanium", "47.867", 4, 4,
    "V", "Vanadium", "50.9415", 5, 4,
    "Cr", "Chromium", "51.9961", 6, 4,
    "Mn", "Manganese", "54.938045", 7, 4,
    "Fe", "Iron", "55.845", 8, 4,
    "Co", "Cobalt", "58.933195", 9, 4,
    "Ni", "Nickel", "58.6934", 10, 4,
    "Cu", "Copper", "63.546", 11, 4,
    "Zn", "Zinc", "65.38", 12, 4,
    "Ga", "Gallium", "69.723", 13, 4,
    "Ge", "Germanium", "72.63", 14, 4,
    "As", "Arsenic", "74.9216", 15, 4,
    "Se", "Selenium", "78.96", 16, 4,
    "Br", "Bromine", "79.904", 17, 4,
    "Kr", "Krypton", "83.798", 18, 4,
    "Rb", "Rubidium", "85.4678", 1, 5,
    "Sr", "Strontium", "87.62", 2, 5,
    "Y", "Yttrium", "88.90585", 3, 5,
    "Zr", "Zirconium", "91.224", 4, 5,
    "Nb", "Niobium", "92.90628", 5, 5,
    "Mo", "Molybdenum", "95.96", 6, 5,
    "Tc", "Technetium", "(98)", 7, 5,
    "Ru", "Ruthenium", "101.07", 8, 5,
    "Rh", "Rhodium", "102.9055", 9, 5,
    "Pd", "Palladium", "106.42", 10, 5,
    "Ag", "Silver", "107.8682", 11, 5,
    "Cd", "Cadmium", "112.411", 12, 5,
    "In", "Indium", "114.818", 13, 5,
    "Sn", "Tin", "118.71", 14, 5,
    "Sb", "Antimony", "121.76", 15, 5,
    "Te", "Tellurium", "127.6", 16, 5,
    "I", "Iodine", "126.90447", 17, 5,
    "Xe", "Xenon", "131.293", 18, 5,
    "Cs", "Caesium", "132.9054", 1, 6,
    "Ba", "Barium", "132.9054", 2, 6,
    "La", "Lanthanum", "138.90547", 4, 9,
    "Ce", "Cerium", "140.116", 5, 9,
    "Pr", "Praseodymium", "140.90765", 6, 9,
    "Nd", "Neodymium", "144.242", 7, 9,
    "Pm", "Promethium", "(145)", 8, 9,
    "Sm", "Samarium", "150.36", 9, 9,
    "Eu", "Europium", "151.964", 10, 9,
    "Gd", "Gadolinium", "157.25", 11, 9,
    "Tb", "Terbium", "158.92535", 12, 9,
    "Dy", "Dysprosium", "162.5", 13, 9,
    "Ho", "Holmium", "164.93032", 14, 9,
    "Er", "Erbium", "167.259", 15, 9,
    "Tm", "Thulium", "168.93421", 16, 9,
    "Yb", "Ytterbium", "173.054", 17, 9,
    "Lu", "Lutetium", "174.9668", 18, 9,
    "Hf", "Hafnium", "178.49", 4, 6,
    "Ta", "Tantalum", "180.94788", 5, 6,
    "W", "Tungsten", "183.84", 6, 6,
    "Re", "Rhenium", "186.207", 7, 6,

];

let camera, scene, renderer;
let controls;
let objects = [];
let targets = { table: [], sphere: [], helix: [], grid: [] };

export default {
    name: 'three-js-page',
    methods: {
        init() {
            camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 10000 );
            camera.position.z = 3000;
            scene = new THREE.Scene();
            // table
            for ( var i = 0; i < table.length; i += 5 ) {
                var element = document.createElement( 'div' );
                element.className = 'element';
                //element.style.backgroundColor = 'rgba(0,127,127,' + ( Math.random() * 0.5 + 0.25 ) + ')';
                var number = document.createElement( 'div' );
                number.className = 'number';
                number.textContent = (i/5) + 1;
                element.appendChild( number );
                var symbol = document.createElement( 'div' );
                symbol.className = 'symbol';
                symbol.textContent = table[ i ];
                element.appendChild( symbol );
                var details = document.createElement( 'div' );
                details.className = 'details';
                details.innerHTML = table[ i + 1 ] + '<br>' + table[ i + 2 ];
                element.appendChild( details );
                var object = new THREE.CSS3DObject( element );
                object.position.x = Math.random() * 4000 - 2000;
                object.position.y = Math.random() * 4000 - 2000;
                object.position.z = Math.random() * 4000 - 2000;
                scene.add( object );
                objects.push( object );
                //
                var object = new THREE.Object3D();
                object.position.x = ( table[ i + 3 ] * 350 ) - 1330;
                object.position.y = - ( table[ i + 4 ] * 400 ) + 990;
                targets.table.push( object );
            }
            // sphere
            var vector = new THREE.Vector3();
            var spherical = new THREE.Spherical();
            for ( var i = 0, l = objects.length; i < l; i ++ ) {
                var phi = Math.acos( -1 + ( 2 * i ) / l );
                var theta = Math.sqrt( l * Math.PI ) * phi;
                var object = new THREE.Object3D();
                spherical.set( 800, phi, theta );
                object.position.setFromSpherical( spherical );
                vector.copy( object.position ).multiplyScalar( 2 );
                object.lookAt( vector );
                targets.sphere.push( object );
            }
            // helix
            var vector = new THREE.Vector3();
            var cylindrical = new THREE.Cylindrical();
            for ( var i = 0, l = objects.length; i < l; i ++ ) {
                var theta = i * 1.175 + Math.PI;
                var y = - ( i * 8 ) + 450;
                var object = new THREE.Object3D();
                cylindrical.set( 900, theta, y );
                object.position.setFromCylindrical( cylindrical );
                vector.x = object.position.x * 3;
                vector.y = object.position.y;
                vector.z = object.position.z * 3;
                object.lookAt( vector );
                targets.helix.push( object );
            }
            // grid
            for ( var i = 0; i < objects.length; i ++ ) {
                var object = new THREE.Object3D();
                object.position.x = ( ( i % 5 ) * 400 ) - 800;
                object.position.y = ( - ( Math.floor( i / 5 ) % 5 ) * 400 ) + 800;
                object.position.z = ( Math.floor( i / 25 ) ) * 1000 - 1000;
                targets.grid.push( object );
            }
            //
            renderer = new THREE.CSS3DRenderer();
            renderer.setSize( window.innerWidth, window.innerHeight );
            document.getElementById( 'container' ).appendChild( renderer.domElement );
            //
            controls = new THREE.TrackballControls( camera, renderer.domElement );
            controls.rotateSpeed = 1.0;
            controls.zoomSpeed = 1.2;
            controls.panSpeed = 0.8;
            controls.noZoom = false;
            controls.noPan = false;
            controls.staticMoving = true;
            controls.dynamicDampingFactor = 0.3;
            controls.keys = [ 65, 83, 68 ];

            controls.addEventListener( 'change', this.render );
            // var button = document.getElementById( 'table' );
            // button.addEventListener( 'click', function ( event ) {
            //     this.transform( targets.table, 2000 );
            // }, false );
            // var button = document.getElementById( 'sphere' );
            // button.addEventListener( 'click', function ( event ) {
            //     this.transform( targets.sphere, 2000 );
            // }, false );
            // var button = document.getElementById( 'helix' );
            // button.addEventListener( 'click', function ( event ) {
            //     this.transform( targets.helix, 2000 );
            // }, false );
            // var button = document.getElementById( 'grid' );
            // button.addEventListener( 'click', function ( event ) {
            //     transform( targets.grid, 2000 );
            // }, false );
            this.transform( targets.sphere, 2000 );
            //
            window.addEventListener( 'resize', this.onWindowResize, false );
        },
        transform( targets, duration ) {
            TWEEN.removeAll();
            for ( var i = 0; i < objects.length; i ++ ) {
                var object = objects[ i ];
                var target = targets[ i ];
                new TWEEN.Tween( object.position )
                    .to( { x: target.position.x, y: target.position.y, z: target.position.z }, Math.random() * duration + duration )
                    .easing( TWEEN.Easing.Exponential.InOut )
                    .start();
                new TWEEN.Tween( object.rotation )
                    .to( { x: target.rotation.x, y: target.rotation.y, z: target.rotation.z }, Math.random() * duration + duration )
                    .easing( TWEEN.Easing.Exponential.InOut )
                    .start();
            }
            new TWEEN.Tween( this )
                .to( {}, duration * 2 )
                .onUpdate( this.render )
                .start();
        },
        onWindowResize() {
            camera.aspect = window.innerWidth / window.innerHeight;
            camera.updateProjectionMatrix();
            renderer.setSize( window.innerWidth, window.innerHeight );
            this.render();
        },
        animate() {
            requestAnimationFrame( this.animate );
            TWEEN.update();
            controls.update();
        },
        render() {
            renderer.render( scene, camera );
        }
    },
    mounted() {
        this.init();
        this.animate();
    }
}
</script>

<style>
html, body {
    height: 100%;
}
body {
    background-color: #000000;
    margin: 0;
    font-family: Helvetica, sans-serif;;
    overflow: hidden;
}
a {
    color: #ffffff;
}
#container {
    position: absolute;
    overflow: hidden;
}
#info {
    position: absolute;
    width: 100%;
    color: #ffffff;
    padding: 5px;
    font-family: Monospace;
    font-size: 13px;
    font-weight: bold;
    text-align: center;
    z-index: 1;
}
#menu {
    position: absolute;
    height: 60px;
    width: 100%;
    text-align: center;
}
.element {
    width: 120px;
    height: 180px;
    box-shadow: 0px 0px 12px rgba(0,255,255,0.5);
    border: 1px solid rgba(127,255,255,0.25);
    text-align: center;
    cursor: default;
    background-image: url("~@/assets/350-400.jpg");
}
.element:hover {
    box-shadow: 0px 0px 12px rgba(0,255,255,0.75);
    border: 1px solid rgba(127,255,255,0.75);
}
    .element .number {
        position: absolute;
        top: 20px;
        right: 20px;
        font-size: 12px;
        color: rgba(127,255,255,0.75);
    }
    .element .symbol {
        position: absolute;
        top: 40px;
        left: 0px;
        right: 0px;
        font-size: 60px;
        font-weight: bold;
        color: rgba(255,255,255,0.75);
        text-shadow: 0 0 10px rgba(0,255,255,0.95);
    }
    .element .details {
        position: absolute;
        bottom: 15px;
        left: 0px;
        right: 0px;
        font-size: 12px;
        color: rgba(127,255,255,0.75);
    }
button {
    color: rgba(127,255,255,0.75);
    background: transparent;
    outline: 1px solid rgba(127,255,255,0.75);
    border: 0px;
    padding: 5px 10px;
    cursor: pointer;
}
button:hover {
    background-color: rgba(0,255,255,0.5);
}
button:active {
    color: #000000;
    background-color: rgba(0,255,255,0.75);
}
</style>
